A scaling analysis is performed to study transport phenomena in the su
percritical fluid extraction process. Two typical systems, one solid-f
luid and one liquid-fluid, are investigated. Characteristic velocities
and time scales of each transport process are determined by force bal
ances. The dominant driving Force in each existing phase and the rate-
determining factor of the entire system are identified. Enhancements o
f practical applications towards more energy efficient operations are
suggested. For situations with insufficient solute transport, differen
t methods of improvement are discussed.